I’m building a home theater room and I am installed recessed lights. Since recessed light cans are notorious for allowing sound to leak through the ceiling, I want to create wooden backer boxes that go around the recessed light cans to seal them up and keep the sound from going through them to the upstairs.
I’m using IC-rated cans. I was going to build the boxes out of OSB and line the inside of them with ¼ inch hardiebacker. I was wondering if that would be safe or if there would be too much heat buildup inside the boxes. I’m not sure how much heat hardiebacker can take.